$x^2+6x=40$
$-5xy+3xy$
$6x^2-13x-5$
$\left(3x-1\right)^2-\left(4x+1\right)^2$
$250+350+800$
$\left(9x^3y^2-3z^4\right)^2$
$ab^8-7a^3b^2-ab^6+a^2b^5$
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